This paper reviews 19 separate studies published over the past 12 years that examine the potential for deploying greater energy efficiency in the South. These studies contain more than 250 estimates of the energy efficiency potential for different fuels (electricity, natural gas, and all fuels), sectors of the economy (residential buildings, commercial buildings, and industry), and types of potential (technical, economic, maximum achievable, and moderate achievable). The meta-review concludes that a reservoir of cost-effective energy savings exists in the South. The full deployment of these nearly pollution-free opportunities could largely offset the growth in energy consumption forecast for the region over the next decade.